A 3D large signal model for helix TWT

Author

David, Jean-Francois ; Bariou, D.

Author_Institution

Thales Electron Devices, Velizy, France

fYear

2013

fDate

21-23 May 2013

Firstpage

1

Lastpage

2

Abstract

In a helix traveling wave tube, the interaction between the electron beam and the backward wave can lead to instabilities as BWO (backward wave oscillation) if the beam current is large enough. As the efficient part of the circuit fields varies in the angular direction, a 3D tool is needed to model such a phenomena. The numerical model is presented, with some examples of BWO starting conditions research. Close to the π mode, both forward and backward interact with the beam and any coupling of both waves has a strong effect. Consequently the threshold current is lowered. Several causes of coupling have been studied.

Keywords

backward wave oscillators; travelling wave tubes; π mode; 3D large signal model; 3D tool; BWO; backward wave oscillation; helix TWT; helix traveling wave tube; numerical model; threshold current; Computational modeling; Couplings; Electron tubes; Harmonic analysis; Integrated circuit modeling; Oscillators; Solid modeling; π mode oscillation; 3D modeling software; BW oscillation; Helix TWT (Traveling Wave Tube);

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International

Conference_Location

Paris

Print_ISBN

978-1-4673-5976-4

Type

conf

DOI

10.1109/IVEC.2013.6571135

Filename

6571135